Kegley, C. W. (1978). Introduction to logic. Charles E. Mrrill.
Chicago-čujuhus (17. p.)Kegley, Charles W. Introduction to Logic. London: Charles E. Mrrill, 1978.
MLA-čujuhus (9. p.)Kegley, Charles W. Introduction to Logic. Charles E. Mrrill, 1978.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.